In a MacOS App using SwiftUI, how to modify the default blue background of a selected NavigationLink nested in a list? - macos

Question

Good day all. In a MacOS App using SwiftUI, how to modify the default blue background of a selected NavigationLink nested in a list? The list is inside a NavigationView. I could not find the solution here. What would be the code to add to the following basic exemple: Two TextView listed, and if we click on the TextView we display the correspondant View.
ContentView.swift:
import SwiftUI
struct ContentView: View {
#State var selection: Int?
var body: some View {
HStack() {
NavigationView {
List () {
NavigationLink(destination: FirstView(), tag: 0, selection: self.$selection) {
Text("Click Me To Display The First View")
} // End Navigation Link
NavigationLink(destination: SecondView(), tag: 1, selection: self.$selection) {
Text("Click Me To Display The Second View")
} // End Navigation Link
} // End list
.frame(minWidth: 350, maxWidth: 350)
.onAppear {
self.selection = 0
}
} // End NavigationView
.listStyle(SidebarListStyle())
.frame(maxWidth: .infinity, maxHeight: .infinity)
} // End HStack
} // End some View
} // End ContentView
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView()
}
}
FirstView.swift:
import SwiftUI
struct FirstView: View {
var body: some View {
Text("(1) Hello, I am the first view")
.frame(maxWidth: .infinity, maxHeight: .infinity)
}
}
struct FirstView_Previews: PreviewProvider {
static var previews: some View {
FirstView()
}
}
SecondView.swift:
import SwiftUI
struct SecondView: View {
var body: some View {
Text("(2) Hello, I am the second View")
.frame(maxWidth: .infinity, maxHeight: .infinity)
}
}
struct SecondView_Previews: PreviewProvider {
static var previews: some View {
SecondView()
}
}
Here is the result if we click on the first row... the background is blue when selected! How to change this default color? Thanks in advance for your help.

Answer 1

the following code is one option to achieve what you want:
struct ContentView: View {
#State var selection: Int? = 0
#State var pressed: Int? = 0
init() {
UITableViewCell.appearance().selectionStyle = .none
UITableView.appearance().backgroundColor = UIColor.clear
}
var body: some View {
var theBinding = Binding(
get: { self.selection },
set: {
self.selection = $0
self.pressed = $0 == nil ? self.pressed : $0!
})
return HStack() {
NavigationView {
List {
NavigationLink(destination: FirstView(), tag: 0, selection: theBinding) {
Text("Click Me To Display The First View")
}.listRowBackground(self.pressed == 0 ? Color.red : Color.green)
NavigationLink(destination: SecondView(), tag: 1, selection: theBinding) {
Text("Click Me To Display The Second View")
}.listRowBackground(self.pressed == 1 ? Color.red : Color.green)
}.frame(minWidth: 350, maxWidth: 350)
.onAppear { self.pressed = 0 }
}.listStyle(SidebarListStyle())
.frame(maxWidth: .infinity, maxHeight: .infinity)
}
}
}